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A Blank Wall Can Show How Many People Are in a Room and What They’re Doing

A Blank Wall Can Show How Many People Are in a Room and What They’re Doing

2 years ago
Anonymous $BH0TGXkyPe

https://www.scientificamerican.com/article/a-blank-wall-can-show-how-many-people-are-in-a-room-and-what-theyre-doing/